Texas recalled Pennington from the Arizona Complex League Rangers on Saturday.
Pennington takes the spot in the Rangers' bullpen vacated by right-hander Josh Sborz, who was placed on the 15-day injured list Saturday due to right shoulder fatigue. Pennington made his last appearance Sept. 21 against the Mariners, during which he allowed three runs on two hits while striking out two across two-thirds of an inning. Across 15 major-league outings with the Rangers this season (including one start), Pennington has a 3.12 ERA and 1.73 WHIP across 17.1 innings.